Week 38, 2027
September 20–26, 2027
Monday September 20 – Sunday September 262027-W38Days 263–269
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, Sep 20 | 2027-W38-1 | 263 | 39 | 19 Rabi' al-Thani 1449 AH | Respect for the Aged Day (Japan) |
| Tue, Sep 21 | 2027-W38-2 | 264 | 39 | 20 Rabi' al-Thani 1449 AH | |
| Wed, Sep 22 | 2027-W38-3 | 265 | 39 | 21 Rabi' al-Thani 1449 AH | |
| Thu, Sep 23 | 2027-W38-4 | 266 | 39 | 22 Rabi' al-Thani 1449 AH | Autumnal Equinox Day (Japan) |
| Fri, Sep 24 | 2027-W38-5 | 267 | 39 | 23 Rabi' al-Thani 1449 AH | Heritage Day (South Africa) |
| Sat, Sep 25 | 2027-W38-6 | 268 | 39 | 24 Rabi' al-Thani 1449 AH | |
| Sun, Sep 26 | 2027-W38-7 | 269 | 40 | 25 Rabi' al-Thani 1449 AH |
About week 38
In US numbering, where weeks start on Sunday and the week of January 1 is week 1, Monday to Saturday are US week 39 and Sunday US week 40.
Holidays this week: Respect for the Aged Day on Mon, Sep 20 in Japan; Autumnal Equinox Day on Thu, Sep 23 in Japan; Heritage Day on Fri, Sep 24 in South Africa. On Sun, Sep 26 clocks in New Zealand go forward one hour at 2:00 a.m. The September equinox is on Thu, Sep 23 at 06:02 UTC. All weeks of 2027 lists the neighbouring weeks.
Week 38 in other years
| Year | Week 38 runs |
|---|---|
| 2025 | Mon, Sep 15 – Sun, Sep 21 |
| 2026 | Mon, Sep 14 – Sun, Sep 20 |
| 2027 | Mon, Sep 20 – Sun, Sep 26 |
| 2028 | Mon, Sep 18 – Sun, Sep 24 |
| 2029 | Mon, Sep 17 – Sun, Sep 23 |
| 2030 | Mon, Sep 16 – Sun, Sep 22 |
In 2028, week 38 runs Mon, Sep 18 – Sun, Sep 24: 364 days later, 2 days earlier in the calendar. Over the 400-year cycle, the Monday of week 38 falls between September 13 and September 20.
By the end of week 38, 269 days of 2027 have passed (73.7% of the year), and 14 ISO weeks of 2027 remain. The week falls in Q3.
Writing week 38
ISO 8601 writes this week as 2027-W38 (basic format 2027W38), from 2027-W38-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.